What volts should the coil read during cranking?

BSAM450

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2 POSTS

1973 DODGE TRUCK

When I turn the key on the test light on the positive side of the coil lights up. When I crank the engine over the light goes off. It seems to me when I let off the key it will then fire. Can you help me in the right direction.

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Saturday, February 25th, 2012 AT 5:32 PM

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HMAC300

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49,711 POSTS

Replace the ballast resistor on the firewall. That sounds like your problem.

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Saturday, February 25th, 2012 AT 6:34 PM

BSAM450

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Well I forgot to mention that I did replace the resitor on the wall and also the module box. It wouldn't even fire before that.

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Saturday, February 25th, 2012 AT 7:07 PM

HMAC300

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49,711 POSTS

Check gap of pickup coil in dist.008-.010" resistance of pu coil should be 400-800 ohms